ACT Math 3.3 Plane Geometry
ACT Math: Plane Geometry Drill 3, Problem 3. What is the measure of angle ABC?
|ACT Math||Plane Geometry|
|ACT Mathematics||Plane Geometry|
|Foreign Language||Arabic Subtitled|
|Product Type||ACT Math|
is 2pi and line BC right here
is 4. We also know that circle problems are gonna test us on
two basic formula usually. Area
which is pi r squared and circumference which is 2
pi r. We've been told that line BC is a radius
so let's plug it in to solve for circumferance
since line BC is 4 is for we know that 2
pi 4 is just 8pi. They give us
that this arc is 2 pi so what's 2
pi over 8pi? Yeah, it's 1/4 and
all the way around the clock is 360 degrees. 1/4 of the way around the clock
is from midnight to 3
recognize anything special about this little angle here?
Yeah. It's right!
This right. Yeah ninety degrees. It's E.